As a senior engineer reviewing this API implementation, the codebase exhibits critical architectural and operational flaws centered on I/O handling and configuration management. * **Blocking I/O:** Avoid `fs.appendFileSync` in Express; it synchronously blocks the critical Node.js event loop during disk persistence. * **Architectural Overload:** Decouple the massive 100-iteration fetching loop from the simple Express route handler to prevent resource exhaustion. * **Brittle Configuration:** Replace the hardcoded absolute Windows path with configuration management or environment variables for portability. * **Concurrency Refinement:** Migrate the file writing function to use `fs.promises` to utilize non-blocking asynchronous await patterns effectively. * **Error Masking:** Remove the unnecessary callback function passed to `fs.appendFileSync`, as synchronous methods do not execute callbacks.
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